Ni (II) doping induced lattice distortion in Zn3In2S6/BiOBr-OVs for boosting photocatalytic removal of antibiotics and Cr (Ⅵ) performance

Abstract

Ni doping was used to create S-scheme heterojunction Ni-Zn3In2S6/BiOBr photocatalyst with an oxygen vacancy. This catalyst could remove both metronidazole and Cr (VI). The addition of Ni replaced Zn in the lattice of Zn3In2S6, inducing the generation of lattice distortion and increase the separation efficiency of charge carriers. For MNZ and Cr (VI), N-ZISB-2 (with 2 wt% Ni doping and 15 wt% BiOBr loading) demonstrated the best photocatalytic removal ability (MNZ: 99.31 %, Cr (VI): 99.83 %). The results of XRD and TEM indicated the successful substitution of Ni.The outcomes of XPS, UPS, and ESR demonstrated that the S-scheme heterojunction mechanism was followed by N-ZISB-x. Most intermediates of degradation had little ecological toxicity. In this work, we propose three potential routes for MNZ deterioration. XPS was used to confirm Cr (VI)'s reduction process. This investigation looked at the impact of oxygen vacancies and lattice distortion on photocatalytic performance.